I have personally tried to pretty much let the whole MAC Defender trojan thing pass by, since we're not a security website. However, we have an interesting turn of events this week. An article over at Ars Technica quotes several anonymous Apple Store employees as saying that the infection rate of Macs brought into the Apple store has gone up considerably. More interestingly though, Apple's official policy states that Apple Store employees are not allowed to talk about infections to anyone - they're not even allowed to inform Mac owners if they find the infection without the customer's knowledge. Another interesting tidbit: Apple mandates the use of Norton Antivirus on company Macs, according to one Apple Store genius.

Not more than any other company, maybe more than Apple. MS provides an AV because due to the legacy of its terrible security in the recent past, there are many orders of magnitude more Windows viruses, than viruses for any other OS.